US4486122A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and device for reducing the risk of freezing of surface-water pipe-line systems
Assignee: Individual
•
Filing: 1982-02-11
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Granted: 1984-12-04
•
Expires: 2002-02-11
Abstract
Abstract A method for reducing the risk of freezing of surface-water pipe-line systems of the kind comprising a plurality of drains and other inlets, such as rain-water drains, manholes and inlets from terrace and roof guttering, etc. Means are provided which prevent or reduce air currents in at least one of the drains and other inlets through which the flow of air would otherwise be excessive. The means is designed to permit water to flow therethrough without appreciable gathering of water therein.
Inventors
- 👤 Oscar S. Arntyr
- 👤 Thord I. Engstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:06
CPC Classifications
E; E04; E04D; E04D13/00; E04D13/04; E04D13/0404; E04D13/0409; E03; E03F; E03F5/00; E03F5/04; E03F5/0401; E03F5/041; E03F2005/0416; E03F2005/0417; E04D2013/0418; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7879; Y10T137/788; Y10T137/7882
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
133 words
Pipe-line system for surface-water including a plurality of drains and other inlets, such as rain-water drains, manholes and inlets from terrace and roof guttering, etc., characterized in that in order to reduce the risk of freezing of the system special means (5) are mounted in at least some of the drains (1) or other inlets which are so located that the flow of air therethrough can be heavy, said means (5) being arranged to reduce such heavy flow of air in both directions through the respective drain but not to prevent some ventilation of the system and designed to permit a small flow of water to pass directly therethrough without appreciable gathering of water in said means and to be automatically opened when required to permit a greater flow of water to pass.
Claim 2
Dependent Claim
133 words
Pipe-line system for surface-water including a plurality of drains and other inlets, such as rain-water drains, manholes and inlets from terrace and roof guttering, etc., characterized in that in order to reduce the risk of freezing of the system special means (5) are mounted in at least some of the drains (1) or other inlets which are so located that the flow of air therethrough can be heavy, said means (5) being arranged to reduce such heavy flow of air in both directions through the respective drain but not to prevent some ventilation of the system and designed to permit a small flow of water to pass directly therethrough without appreciable gathering of water in said means and to be automatically opened when required to permit a greater flow of water to pass.
Claim 3
Dependent Claim
30 words
A pipe-line system according to claim 1, characterized in that said means comprises a spring-biassed air seal (5) arranged in the upper end of respective drains (1) or other inlet.
Claim 4
Dependent Claim
59 words
A pipe-line system according to claim 2, characterized in that the air seal comprises a funnel-shaped sleeve (5) made of a flexible, substantially gas-impermeable material, the lower end of which sleeve is normally held closed by means of at least one spring (6) so arranged that it attempts to flatten out the lower opening of the sleeve by stretching.
Claim 5
Dependent Claim
29 words
A pipe-line system according to claim 3, characterized in that said spring comprises a leaf spring (6) held at both ends to the lower edge of the sleeve (5).
Claim 6
Dependent Claim
23 words
A pipe-line system according to claim 3 or claim 4 characterized in that the lower end of the sleeve (5) is cut obliquely.
Claim 7
Independent Claim
126 words
A method for reducing the risk of freezing of a surface-water pipe-line system which comprises a plurality of drains and other inlets, such as rain-water drains, manholes and inlets from terrace and roof guttering, etc., characterized by providing special means in at least some of the drains and other inlets which are so located that the flow of air therethrough can be heavy, and designing said means to reduce such heavy flow of air in both directions through the respective drain, but not to prevent some ventilation of the system, and to permit a small flow of water to pass directly therethrough without appreciable gathering of water in said means and to be automatically opened when required to permit a greater flow of water to pass.
Claim 8
Independent Claim
126 words
A method for reducing the risk of freezing of a surface-water pipe-line system which comprises a plurality of drains and other inlets, such as rain-water drains, manholes and inlets from terrace and roof guttering, etc., characterized by providing special means in at least some of the drains and other inlets which are so located that the flow of air therethrough can be heavy, and designing said means to reduce such heavy flow of air in both directions through the respective drain, but not to prevent some ventilation of the system, and to permit a small flow of water to pass directly therethrough without appreciable gathering of water in said means and to be automatically opened when required to permit a greater flow of water to pass.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |